Toy piggy bank



FIG. 1 is a front perspective view of a toy piggy bank showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right-side elevational view thereof, the left side being substantially a mirror image; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a toy piggy bank, substantially as shown and described. 